HackingHealthcareHealthcareData ExfiltratedSupply Chain (3P Vendor)Business Associate (HIPAA)Customer Data InvolvedPHIGovernment IDIdentity (basic)Health (basic)MediumContained

Mountain Laurel Medical Center

bd_518c3b8fae86c40c · schema v1 · pii pii-v2

Severity

Medium

Discovered

Dec 18, 2025

Filed

Sep 1, 2026

To disclose

—

Affected

Not disclosed

Confidence

66%

Full breach record for Mountain Laurel Medical Center →

Mountain Laurel Medical Center notified patients that its vendor, Aesto, LLC, experienced a security incident affecting AWS infrastructure. Between Dec 2-18, 2025, an unauthorized actor copied PHI including names, DOBs, SSNs, MRNs, and addresses. Aesto confirmed the breach on May 26, 2026. 24 months of credit monitoring is offered.

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Incident timeline

undetected · 16 days

Dec 2, 2025

Begins

Dec 18, 2025

Discovered

Sep 1, 2026

Filed

Tracked as a single-filing incident — the only disclosure on record for this event so far.ConfirmedView incident

Name: Mountain Laurel Medical Center
norm: mountain laurel medical center

Name: Mountain Laurel Medical Center
norm: mountain laurel medical center
Industry: Healthcarellm

Discovered: Dec 18, 2025
Breach occurred: Dec 2, 2025 – Dec 18, 2025
Undetected for: 16 daysoccurrence → discovery
Materiality determined: —
Notification sent: Sep 1, 2026
Affected individuals: Not disclosed
Data types: PHIGovernment IDIdentity (basic)Health (basic)
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1041 Exfiltration Over C2 Channel
Threat actor: External
Third party: via Aesto, LLC

During the incident: Commenced a prompt and thorough investigation
Worked very closely with external cybersecurity professionals experienced in handling these types of incidents
Conducted extensive forensic investigation and manual document review
Offering a complimentary 24 month membership of credit monitoring services at no charge
Set up a dedicated and confidential toll-free response line to respond to questions
Changes made: Continually evaluate and modify practices and internal controls to enhance the security and privacy of personal information
Source: Quoted from the filing itself, not independently verified.

Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://www.mass.gov/doc/2026-1480-mountain-laurel-medical-center/download
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 1, 2026
Raw hash: 2b4ced74cc5f5aba1896bd98e33c4e61f4d5ab7e7dacce4e3c05fa3309d65ee2

Reporting entityMountain Laurel Medical Center

Victim entityMountain Laurel Medical Center

Incidentdiscovered Dec 18, 2025

Stated responseCommenced a prompt and thorough investigation

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancewww.mass.gov